Steady state and transient analysis of compact plate-fin heat exchanger fins for generation of design data using CFD

Ranganayakulu, C.

doi:10.1108/hff-01-2015-0039

Cited by 15 publications

(9 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Finally, the f and j values are generated using CFD technique for different types of offset strip fins and wavy fins. The complete results can be seen in earlier papers (Ranganayakulu et al , 2008; Sheik Ismail et al , 2009; Chennu and Paturu, 2011; Chennu, 2016; Rao et al , 2013, 2016, 2015; Ramana Murthy et al , 2015; Muppala et al , 2015). However, the correlations generated using CFD are listed below for various types of fins in Table II for ready reference.…”

Section: Cfd Analysissupporting

confidence: 57%

Numerical analysis of compact plate-fin heat exchangers for aerospace applications

Ranganayakulu

2018

HFF

Self Cite

View full text Add to dashboard Cite

Purpose The purpose of this study is to find the thermo-hydraulic performances of compact heat exchangers (CHE’s), which are strongly depending upon the prediction of performance of various types of heat transfer surfaces such as offset strip fins, wavy fins, rectangular fins, triangular fins, triangular and rectangular perforated fins in terms of Colburn “j” and Fanning friction “f” factors. Design/methodology/approach Numerical methods play a major role for analysis of compact plate-fin heat exchangers, which are cost-effective and fast. This paper presents the on-going research and work carried out earlier for single-phase steady-state heat transfer and pressure drop analysis on CHE passages and fins. An analysis of a cross-flow plate-fin compact heat exchanger, accounting for the individual effects of two-dimensional longitudinal heat conduction through the exchanger wall, inlet fluid flow maldistribution and inlet temperature non-uniformity are carried out using a Finite Element Method (FEM). Findings The performance deterioration of high-efficiency cross-flow plate-fin compact heat exchangers have been reviewed with the combined effects of wall longitudinal heat conduction and inlet fluid flow/temperature non-uniformity using a dedicated FEM analysis. It is found that the performance deterioration is quite significant in some typical applications due to the effects of wall longitudinal heat conduction and inlet fluid flow non-uniformity on cross-flow plate-fin heat exchangers. A Computational Fluid Dynamics (CFD) program FLUENT has been used to predict the design data in terms of “j” and “f” factors for plate-fin heat exchanger fins. The suitable design data are generated using CFD analysis covering the laminar, transition and turbulent flow regimes for various types of fins. Originality/value The correlations for the friction factor “f” and Colburn factor “j” have been found to be good. The correlations can be used by the heat exchanger designers and can reduce the number of tests and modification of the prototype to a minimum for similar applications and types of fins.

show abstract

Section: Cfd Analysissupporting

confidence: 57%

Numerical analysis of compact plate-fin heat exchangers for aerospace applications

Ranganayakulu

2018

HFF

Self Cite

View full text Add to dashboard Cite

show abstract

“…Geometrical modification (wavy walls) combined with the use of nanofluid as the working media is one efficient method of passive heat transfer enhancement used satisfactorily for thermal systems such as solar collectors, heat exchangers and heat sinks. (Hatami and Jing, 2017;Priyam and Chand, 2016;Cheng et al, 2009;Tsai et al, 1999;Chennu, 2016;Comini et al, 2002Comini et al, , 2003. Rush et al (1999) through their experimental work found that the augmentation of heat transport takes place even for a laminar flow regime in a wavy channel due to the enhanced macroscopic mixing.…”

Section: Introductionmentioning

confidence: 99%

Analysis of forced convective nanofluid flow through a wavy channel with linearly varying amplitude at the entrance

Kumar

Mehta

Pati

et al. 2022

HFF

View full text Add to dashboard Cite

Purpose The purpose of this paper is to analyze the heat and momentum transfer for steady two-dimensional incompressible nanofluid flow through a wavy channel with linearly varying amplitude in the entrance region. Design/methodology/approach The mass, momentum and energy conservation equations for laminar flow of Cu-water nanofluids are computationally solved using the finite element method. A parametric study is carried out by varying the dimensionless length of the channel section with varying amplitude (EL), Reynolds number (Re) and nanoparticle volume fraction (Φ) in the ranges 0 ≤ EL ≤ 25.5, 105 ≤ Re ≤ 900 and 0 ≤ Φ ≤ 0.04. Findings A higher heat transfer rate is seen in the wavy channel compared to a plane channel beyond a critical value of Re (Recrit) whose value varies with EL; moreover, the overall heat transfer decreases with EL. The heat transfer rate increases with phi for all EL values investigated. The combined effects of the increase in the overall heat transfer and the associated pressure drop in the wavy channel compared to the parallel plate channel are presented as performance factor (PF) against EL. For the highest value of EL (= 25.5), PF monotonically decreases with Re. For smaller values of EL (= 5.5 and 11.5) and also for EL = 0, PF decreases with Re in the lower and the higher Re regimes, while it increases in the intermediate Re regime. In all cases, PF is higher for φ = 0.04 than for the base fluid. The sensitivity of the average Nusselt number to nanoparticle volume fraction follows a non-monotonic trend with the change in Re, φ and EL. Practical implications This study finds relevance in several applications such as solar collectors, heat exchangers and heat sinks. Originality/value To the best of the authors’ knowledge, the analysis of forced convection flow of nanofluid through a wavy channel with linearly varying amplitude is reported for the first time in the literature.

show abstract

“…They are important in most cases for the narrow ranges of Reynolds and Prandtl number variations as conducting extensive experimental research is very laborious and expensive. Computational fluid dynamic (CFD) simulations are an alternative way of generating the relationships for the Nusselt number as a function of Reynolds and Prandtl numbers (Chennu, 2016; Khoshvaght-Aliabadi et al ., 2014). Chennu (2016) simulated a single-blow test to find correlations for the Colburn and friction factors for plate-fin heat exchanger with wavy and offset strip fins.…”

Section: Introductionmentioning

confidence: 99%

Semi-empirical heat transfer correlations for turbulent tube flow of liquid metals

Taler¹

2018

HFF

View full text Add to dashboard Cite

Purpose The purpose of this paper is to develop new semi-empirical heat transfer correlations for turbulent flow of liquid metals in the tubes, and then to compare these correlations with the experimental data. The Prandtl and Reynolds numbers can vary in the ranges: 0.0001 ≤ Pr ≤ 0.1 and 3000 ≤ Re ≤ 106. Design/methodology/approach The energy conservation equation averaged by Reynolds was integrated using the universal velocity profile determined experimentally by Reichardt for the turbulent tube flow and four different models for the turbulent Prandtl number. Turbulent heat transfer in the circular tube was analyzed for a constant heat flux at the inner surface. Some constants in different models for the turbulent Prandtl number were adjusted to obtain good agreement between calculated and experimentally obtained Nusselt numbers. Subsequently, new correlations for the Nusselt number as a function of a Peclet number was proposed for different models of the turbulent Prandtl number. Findings The inclusion of turbulent Prandtl number greater than one and the experimentally determined velocity profile of the fluid in the tube while solving the energy conservation equation improved the compatibility of calculated Nusselt numbers, with Nusselt numbers determined experimentally. The correlations proposed in the paper have a sound theoretical basis and give Nusselt number values that are in good agreement with the experimental data. Research limitations/implications Heat transfer correlations proposed in this paper were derived assuming a constant heat flux at the inner surface of the tube. However, they can also be used for a constant wall temperature, as for the turbulent flow (Re > 3,000), the relative difference between the Nusselt number for uniform wall heat flux and uniform wall temperature is very low. Originality/value Unified, systematic approach to derive correlations for the Nusselt number for liquid metals was proposed in the paper. The Nusselt number was obtained from the solution of the energy conservation equation using the universal velocity profile and eddy diffusivity determined experimentally, and various models for the turbulent Prandtl number. Four different relationships for the Nusselt number proposed in the paper were compared with the experimental data.

show abstract

Steady state and transient analysis of compact plate-fin heat exchanger fins for generation of design data using CFD

Cited by 15 publications

References 26 publications

Numerical analysis of compact plate-fin heat exchangers for aerospace applications

Numerical analysis of compact plate-fin heat exchangers for aerospace applications

Analysis of forced convective nanofluid flow through a wavy channel with linearly varying amplitude at the entrance

Semi-empirical heat transfer correlations for turbulent tube flow of liquid metals

Contact Info

Product

Resources

About